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      <a href="/2017/09/16/cyclejs-notes-5-design-and-abstraction/" title="Cycle.js学习笔记5--关于框架设计和抽象" itemprop="url">Cycle.js学习笔记5--关于框架设计和抽象</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-09-16T04:28:23.000Z" itemprop="datePublished">2017-09-16</time>
    更新日期:<time datetime="2018-08-18T12:58:12.168Z" itemprop="dateModified">2018-08-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Cycle-js基础概念"><span class="toc-number">1.</span> <span class="toc-text">Cycle.js基础概念</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#人机交互"><span class="toc-number">1.1.</span> <span class="toc-text">人机交互</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#对话抽象"><span class="toc-number">1.2.</span> <span class="toc-text">对话抽象</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#驱动"><span class="toc-number">1.3.</span> <span class="toc-text">驱动</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#流"><span class="toc-number">1.4.</span> <span class="toc-text">流</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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		<p>因为对Rxjs的好感玩上了Cycle.js，《Cycle.js学习笔记》系列用于记录使用该框架的一些笔记。<br>本文我们来细细品味一下整个Cyclejs的核心–流，从不一样的角度开始思考吧。<br><a id="more"></a></p>
<h2 id="Cycle-js基础概念"><a href="#Cycle-js基础概念" class="headerlink" title="Cycle.js基础概念"></a>Cycle.js基础概念</h2><hr>
<p>基础知识什么时候恶补都不为晚。</p>
<h3 id="人机交互"><a href="#人机交互" class="headerlink" title="人机交互"></a>人机交互</h3><p><a href="https://cycle.js.org/dialogue.html" target="_blank" rel="external">官方文档</a>用了这么个高大上的词语形容，“对话抽象”(Dialogue abstraction)、“人机交互”(Human-Computer Interaction)，其实主要讲了以下个东西，容我接地气地讲讲。</p>
<p>首先来看配图：</p>
<p><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/8JS%60Y%7B$TBJ1H%29%7B_~O6DI907.png" alt="image"></p>
<p>先不管为什么官方文档要放这么一张逼死强迫症的缺个顶部的图片，这图片主要讲了一个轮回：</p>
<ul>
<li>人 =&gt; 机：通过操作对机器进行输入，例如从键盘输入内容、用鼠标点击某些元素等</li>
<li>机 =&gt; 人：机器拿到输入内容，根据程序进行计算，人通过眼睛观察得到输出</li>
</ul>
<p>其实这里面主要是进行了这样一个抽象：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">main</span>(<span class="params">输入</span>)</span>&#123;</div><div class="line">    经过一些处理</div><div class="line">    <span class="keyword">return</span> 输出</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>我们来看一个简单的场景：操作者需要登录一个页面。</p>
<ol>
<li>对于操作者–人：</li>
</ol>
<ul>
<li>输入 =&gt; 眼睛获得的图像</li>
<li>处理 =&gt; 打开浏览器</li>
<li>输出 =&gt; 输入一个地址，并按Enter</li>
</ul>
<ol>
<li>对于机器–电脑：</li>
</ol>
<ul>
<li>输入 =&gt; 浏览器获得地址</li>
<li>处理 =&gt; 解析地址，发送请求</li>
<li>输出 =&gt; 返回一个登录页面</li>
</ul>
<ol>
<li>对于操作者–人：</li>
</ol>
<ul>
<li>输入 =&gt; 眼睛获得登录页面</li>
<li>处理 =&gt; 键盘输入帐号密码，登录</li>
<li>输出 =&gt; 上面的一系列操作便是输出</li>
</ul>
<p>以上如此轮回的输入和输出，可以简单理解为人机交互。<br>其实我们在电脑上进行的每一个操作，每一个按键、鼠标移动的每一下，都可以理解为一次输出，也是电脑的一次输入。<br>而电脑每一个显示的变动或是不变，也都是输出，同时是人通过眼睛的一次输入。</p>
<p>这里面的输入输出有各种的媒介：<br>电脑的输入包括键盘、鼠标等，输出包括显示器、音响等。<br>人的输入包括眼睛、耳朵等，输出包括手脚的移动、说话等。</p>
<p>至于这些媒介，我们可以理解为一个接口，或是在Cycle.js里面，可以算是个驱动（Driver）吧，后面章节应该也会讲到。</p>
<h3 id="对话抽象"><a href="#对话抽象" class="headerlink" title="对话抽象"></a>对话抽象</h3><p>上面所说的人机交互，只是一层简单的抽象，而且也有比较主观的角度。</p>
<p>这里我们尝试再进行一层抽象，不管是人还是机器，都是这样的物体：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">main</span>(<span class="params">输入</span>)</span>&#123;</div><div class="line">    经过一些处理</div><div class="line">    <span class="keyword">return</span> 输出</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>现在我们假设，物体和物体之间的交流通过电、光，所以我们得到这样的物体：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">main</span>(<span class="params">输入</span>)</span>&#123;</div><div class="line">    光 = 输入.光</div><div class="line">    处理光</div><div class="line"></div><div class="line">    电 = 输入.电</div><div class="line">    处理电</div><div class="line"></div><div class="line">    <span class="comment">// 输出</span></div><div class="line">    <span class="keyword">return</span> &#123;</div><div class="line">        光: 处理后的光</div><div class="line">        电: 处理后的电</div><div class="line">    &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>这大概是这个世界中所有物体的抽象了。</p>
<p>这时候你可能会有些疑惑，如果每个物体都是这样，那承接这些光和电的传播途径或者方式呢？</p>
<p>到这里，事情变得有意思了，理所当然地，承接这些光和电的便是我们的世界。<br>而我们的世界又是什么呢？其实也是这样一个抽象的物体：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> 处理器(<span class="params">输入</span>)</span>&#123;</div><div class="line">    光 = 输入.光</div><div class="line">    处理光（传输光）</div><div class="line"></div><div class="line">    电 = 输入.电</div><div class="line">    处理电（传输电）</div><div class="line"></div><div class="line">    <span class="comment">// 输出</span></div><div class="line">    <span class="keyword">return</span> &#123;</div><div class="line">        光: 处理后的光</div><div class="line">        电: 处理后的电</div><div class="line">    &#125;</div><div class="line">&#125;</div><div class="line">创建(处理器, &#123;</div><div class="line">    光: 创建光源（驱动器）</div><div class="line">    电：创建电源（驱动器）</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<p>说白了，就是世界除了作为一个普通抽象物体，拥有对光和电的处理（例如传播过程减弱等等），同时还有一个特殊的任务：负责创建光和电的驱动。</p>
<p>这个驱动是什么呢？</p>
<h3 id="驱动"><a href="#驱动" class="headerlink" title="驱动"></a>驱动</h3><p>这个驱动，跟我们平时理解的电脑的驱动有什么区别呢？其实说一样也是一样，说不一样也可以不一样。</p>
<p>其实这里的驱动相当于一些规则，在这里我们理解为对光和电的规则：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line">function 光驱动器() &#123;</div><div class="line">  return 创建流(&#123;</div><div class="line">    天亮了: 监听器 =&gt; &#123;</div><div class="line">      创建光</div><div class="line">      光.改变 = (增强/减弱) =&gt; &#123;</div><div class="line">        监听器.通知(增强/减弱)</div><div class="line">      &#125;</div><div class="line">      光.停止 = (停止) =&gt; &#123;</div><div class="line">        监听器.通知(停止)</div><div class="line">      &#125;</div><div class="line">    &#125;,</div><div class="line">    天黑了: () =&gt; &#123;</div><div class="line">      光.消失();</div><div class="line">    &#125;,</div><div class="line">  &#125;);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>中文的代码是不是看起来好难懂，简单的说，这里面包括一下规则：</p>
<ol>
<li>光的传播处理（<code>改变 =&gt; 监听 =&gt; 通知</code>）</li>
<li>光的出现消失（<code>出现 =&gt; 开始监听</code>, <code>消失 =&gt; 关闭监听</code>）</li>
</ol>
<p>而所有的抽象物体里，输入和输出都遵守这样的处理。</p>
<p>到这里，我们给这个世界创建了物体，然后规定了光和电的规则，创建世界的时候我们便开始根据设定运作起来。</p>
<h3 id="流"><a href="#流" class="headerlink" title="流"></a>流</h3><p>现在还剩下最后一个概念：流。</p>
<p>其实流是最好理解的，它就是我们上面所说的光和电。</p>
<p>我们创建一个世界之后：</p>
<ol>
<li>流的规则设定好，流开始流动；</li>
<li>流的流动，表现为世界对流的输入 =&gt; 处理 =&gt; 输出；</li>
<li>物体和世界、物体间通过流来进行交流，表现为输入 =&gt; 处理 =&gt; 输出；</li>
<li>若世界消失，流消失，物体无输入也便无输出，表现为消失。</li>
</ol>
<p>[捂脸]感觉自己说的也好抽象，不过这是一个挺有意思的角度。不管Cycle.js适不适合用来做项目，但是这样一些新的想法和理念对设计和思路都能拓展空间。</p>
<p>这样的思路拓展到我们的页面中，便有了Cycle.js：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">main</span>(<span class="params">sources</span>) </span>&#123;</div><div class="line">  <span class="comment">// 流的处理</span></div><div class="line">  </div><div class="line">  <span class="keyword">return</span> &#123;</div><div class="line">    <span class="attr">DOM</span>: DOM$, <span class="comment">// 处理后的DOM流</span></div><div class="line">    router: router$, <span class="comment">// 处理后的router流</span></div><div class="line">    HTTP: HTTP$ <span class="comment">// 处理后的HTTP流</span></div><div class="line">  &#125;;</div><div class="line">&#125;</div><div class="line"></div><div class="line">run(main, &#123;</div><div class="line">  <span class="attr">DOM</span>: makeDOMDriver(), <span class="comment">// DOM驱动</span></div><div class="line">  router: makeRouterDriver(), <span class="comment">// 路由驱动</span></div><div class="line">  HTTP: makeHTTPDriver() <span class="comment">// HTTP驱动</span></div><div class="line">&#125;);</div></pre></td></tr></table></figure>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这节主要发挥本骚年的大脑洞，来进行思想探索。<br>主要是尝试讲解了一下Cycle.js的设计思路，当然这只是本骚年的理解，或许有些理解不到位，甚至完全颠倒的地方，请多多包涵，和仅供参考。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
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  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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